Barometer (detail), made by James Watt

© National Museums Scotland

000-190-000-949-C

Barometer, made by James Watt

© National Museums Scotland

000-100-044-625-C

Plotting protractor
made in Edinburgh

© National Museums Scotland

000-100-102-714-C

Surveyors' compass
Probably made in Glasgow

© National Museums Scotland

000-100-102-666-C